Ammonia and nitrite tests are pointless in a running reef, where as calcium, alkalinity, mg, phosphate, and nitrate are critical to know. And the only test that comes with a sw master kit that you will need is nitrate. And with an sps in the tank ( that may be in trouble, op I suggest you google slow tissue necrosis and look at pictures and compare them to that monti) trace element levels become even more important to know.